Conveyor device for conveying food products

ABSTRACT

A conveyor device is provided for conveying food products in stacks or interleaved units made of a plurality of slices of cheese or meat products. The conveyor device formats the food products in a specific product format on a plurality of parallel conveyor tracks, and fills a product gap on one of the plurality of parallel conveyor tracks incoming on the input side with a food product so that on the output side all parallel conveyor tracks are supplied with the food products. At least one product sensor is configured to detect a supply of food product on each conveyor track incoming on the input side.

CROSS-REFERENCE TO RELATED APPLICATION(S)

This present application is a divisional application of co-pending U.S.Non-Provisional patent application Ser. No. 17/062,893, filed on Oct. 5,2020, which is a divisional application of co-pending U.S.Non-Provisional patent application Ser. No. 16/663,943, filed Oct. 25,2019, now U.S. Pat. No. 10,807,748, which is a divisional application ofU.S. Non-Provisional patent application Ser. No. 16/058,078, filed Aug.8, 2018, now U.S. Pat. No. 10,457,433, which is a continuation of U.S.Non-Provisional patent application Ser. No. 14/628,434, filed Feb. 23,2015, now U.S. Pat. No. 10,065,757, which claims the priority benefit ofGerman Patent Application No. 10 2014 002 530.6, filed Feb. 24, 2014,all of which are incorporated by reference herein.

FIELD OF THE DISCLOSURE

The invention relates to a conveyor device for conveying food productson a plurality of parallel conveyor tracks and for formatting the foodproducts in a specific product format, especially for conveying andformatting stacks or interleaved units made of a plurality of slices ofcheese or meat products.

BACKGROUND

Known from EP 2 420 363 A1 is a slicer that makes it possible to slicefood products (e.g. salami, ham, cheese) into slices, wherein the slicerconveys the food products to be sliced through the slicing device on aplurality of parallel conveyor tracks, then slices them and outputs themon the output side. The conveying speed and thus the advance of theindividual food products may be adjusted separately for the individualconveyor tracks.

FIG. 4 is a top view of a conventional processing line having such aslicing device 1 with an output conveyor 2 with two parallel conveyortracks 3, 4. The output side of the output conveyor 2 for the slicingdevice 1 is connected to an input conveyor 5 for a feeder 6, wherein theinput conveyor 5 for the feeder 6 also has two parallel conveyor tracks7, 8. The feeder 6 has the task of placing in packaging the sliced foodproducts A-K that are received on the input side. The structure andfunctioning of the feeder 6 is known per se from the prior art andtherefore need not be described in greater detail.

During the slicing process, the slicing device 1 initially outputs onthe output conveyor 2 pairs A-B, C-D, E-F, and G-H of the food productsA-K so that initially the two conveyor tracks 3, 4 are supplied with twoadjacently disposed food products. The feeder 6 is able to process thisproduct format with two adjacently disposed food products with noproblem.

However, normally during a slicing process product gaps 9 occur in oneof the two conveyor tracks 3, 4 for the slicing device 1.

One possible cause of the product gaps 9 is that the food product to besliced that is on the conveyor track 4 was shorter prior to being slicedthan the food product to be sliced that is on the conveyor track 3 sothat the food product on the conveyor track 4 is used up earlier thanthe food product on the conveyor track 3, which then leads to productgaps 9. This cause of the product gaps 9 is relevant for instance if theproducts in question are natural products (e.g. ham) that do not have adefined length but whose lengths instead are subject to naturalfluctuations.

Another potential cause of product gaps 9 is that the slicing device 1slices the food products in the two conveyor tracks 3, 4 with adifferent slice thickness.

Another potential cause of the product gaps 9 is that the portion sizesof the food products A-K or B-H in the two conveyor tracks 3 and 4 aredifferent in size. For instance, if the food products B-H in theleft-hand conveyor track 4 are for instance stacks of meat slices havinga total weight of 200 grams each, that food product will be finishedearlier than in the right-hand conveyor track 3, if the individual foodproducts A-K there are stacks of slices having a total weight of 100grams each.

Regardless of the various possible causes of the product gaps 9, theproduct format at the input to the feeder 6 then no longer meets therequirements of the feeder 6, because the latter expects that the twoconveyor tracks 7, 8 of the input conveyor 5 for the feeder 6 both havefood products, In contrast, a product gap in one of the two conveyortracks 7, 8 at the input for the feeder 6 can lead to problems.

SUMMARY

The underlying object of the invention is therefore to prevent suchproduct gaps when food products are sliced on a plurality of parallelconveyor tracks having separately adjustable conveyor speeds.

This object is attained using an inventive conveyor device and acorresponding method in accordance with the independent claims

The invention includes the general technical teaching of filling withfood products any product gaps on one of the conveyor tracks at theoutput of a slicing device so that when possible both conveyor tracksare always supplied with food products at the output of the slicingdevice.

The invention therefore provides a conveyor device that is arrangeddownstream of the slicing device, in the conveying direction, and thustransfers sliced food products (e.g. stacks of sliced cold cuts) to aplurality of parallel conveyor tracks.

The food products may be for instance slices of cold cuts, ham, salami,or cheese; however, the invention is not limited to these food productsbut rather may also be realized with other food products.

It should also be noted that the slicing device may provide the foodproducts for instance as stacks or interleaved units made of a pluralityof slices. However, the invention is not limited to stacks orinterleaved units in terms of how product supplied by the slicing deviceis presented, but rather may also be realized with product beingpresented in another manner. For instance, the individual slices mayalso be arranged in a circle or oval. Moreover, it is possible withinthe context of the invention for the individual slices to be offset orinterleaved. It is furthermore possible for the individual slices to befolded. Such product presentations are known per se from the prior artand therefore do not require more detailed description.

The inventive conveyor device now ensures that any product gaps on oneof the parallel conveyor tracks are filled with a food product so thatat the output side all parallel conveyor tracks are supplied with thefood products. The inventive conveyor devices thus provides on theoutput side a product format that comprises a plurality of parallel foodproducts (e.g. stacks of slices). This is advantageous because such aproduct format is important for a downstream feeder for productpackaging.

If there is an even number of product gaps on one of the conveyortracks, the product gap may be filled with an excess food product fromthe other conveyor track with nothing further. For instance, if theright-hand conveyor track includes eight food products (e.g. stacks ofslices), while the left-hand conveyor track contains only six foodproducts (e.g. stacks of slices), one food product may be transferredfrom the right-hand conveyor track to the left-hand conveyor track sothat then both conveyor tracks each include food products one after theother. The result is thus that all of the conveyor tracks are suppliedwith food products at the output of the inventive conveyor device.

However, if there is an odd number of product gaps in one of theconveyor tracks, this manner of filling the product gaps is not adequatefor ensuring that all of the conveyor tracks are supplied with foodproducts at the output of the conveyor device. For instance, if theright-hand conveyor track includes eight food products (e.g. stacks ofslices), while the left-hand conveyor track includes only five foodproducts (e.g. stacks of slices), one of the three product gaps in theleft-hand conveyor track may be supplied with one food product from theright-hand conveyor track. As a result, the right-hand conveyor trackthen includes seven food products one after the other, while theleft-hand conveyor track includes only six food products and still has aproduct gap. For such cases, the inventive conveyor device preferablyhas one product buffer that includes at least one food product so thatthe remaining product gap in the left-hand conveyor track may then befilled with one of the food products in the product buffer.

The product gaps in one of the conveyor tracks are thus first filledwith food products from the other conveyor track when this is possible.The food products held ready in the product buffer are then preferablyused for filling product gaps only if this should be necessary becausethe number of product gaps in one of the conveyor tracks is uneven.

However, it would also be possible in principle in the context of theinvention for the product gaps in one of the conveyor tracks to befilled only from the product buffer. Furthermore, in principle it isalso possible for the product gaps in one of the conveyor tracks to befilled only with food products from the other conveyor tracks.Preferably, however, the two manners of filling product gaps explainedin the foregoing are combined with one another.

In one preferred exemplary embodiment of the invention the conveyordevice has a distributor conveyor that selectively distributes the foodproducts incoming on the input side to a main flow or to the productbuffer.

The product buffer is formed by a buffer conveyor that is supplied withthe food products by the distributor conveyor. The distributor conveyorpreferably conducts the food products incoming on the input side ontobuffer conveyor until the buffer conveyor is filled. This isadvantageous because then there is always sufficient food products onthe buffer conveyor for filling product gaps in one of the conveyortracks. When a buffer conveyor is completely or adequately filled,however, the distributor conveyor preferably conducts the food productsincoming on the input side into the main flow to a downstream main flowconveyor. In the preferred embodiment, the main flow conveyor does nothave to be supplied with food products only by the distributor conveyor,however, but instead may also be supplied by the buffer conveyor if thisshould be necessary for filling product gaps.

Moreover, the inventive conveyor device has a transfer device that cantransfer food products between the parallel conveyor tracks for fillingproduct gaps.

In the preferred exemplary embodiment, the transfer device is aso-called shuttle conveyor that may be displaced as a whole transverseto the direction of conveyance in order to displace between the conveyortracks the food products incoming on the input side of the shuttleconveyor. The shuttle conveyor therefore as a rule has a wider conveyorwidth than the other components of the conveyor device so that theshuttle conveyor, regardless of its displacement position transverse tothe direction of conveyance, always covers the entire width of the otherconveyor belt.

However, alternatively it is also possible for a transfer robot to beemployed as the transfer device and for it to be able to pick up a foodproduct from the conveyor belt and to put it down again on anotherconveyor track. Such transfer robots are known per se from the prior artand therefore need not be described in greater detail.

It has already been mentioned that the distributor conveyor canselectively conduct the food products (e.g. stacks of slices) that areincoming on the input side to the buffer conveyor or to the main flowconveyor. This distribution preferably occurs using a vertical pivotmovement by the distributor conveyor, which enables a rapid change. Theoutput end of the distributor conveyor is therefore preferablyvertically adjustable between the buffer conveyor and the main flowconveyor in order to selectively supply the buffer conveyor or the mainflow conveyor with the food products incoming on the input side.

The buffer conveyor is preferably disposed above the main flow conveyorand its output end may likewise be adjusted vertically.

If a product gap must be filled with a food product from the bufferconveyor, the output end of the buffer conveyor may be lowered to themain flow conveyor in order to place one of the food products from thebuffer conveyor on the main flow conveyor for subsequently filling aproduct gap.

In contrast, if no product gap needs to be filled, the output end of thebuffer conveyor is raised from the main flow conveyor so that the mainflow of the food products may then be advanced on the main flow conveyorundisturbed by the buffer conveyor.

In the preferred exemplary embodiment of the invention, the conveyingspeed of the individual conveyor tracks with the buffer conveyor may beadjusted separately from one another. This is important so that a singlefood product may be transferred from only one of the conveyor tracks ofthe buffer conveyor onto the main flow conveyor. To this end, a conveyortrack of the buffer conveyor is then activated and then conveys the foodproduct therefrom, while the other conveyor tracks of the bufferconveyor do not move.

Moreover, a transfer conveyor having a plurality of parallel conveyortracks is preferably provided, wherein the transfer conveyor isarranged, in the direction of conveyance, downstream of the transferdevice (e.g. shuttle conveyor, transfer robot) and is supplied with foodproducts by the transfer device. What is important here is that even forthe transfer conveyor the conveying speed of the individual conveyortracks may be adjusted separately from one another in order to transferonly one individual food product to only one of the conveyor tracks.

To avoid misunderstanding, it is hereby noted that the term conveyortrack used in the context of the invention means a conveyor track thatis wide enough to receive a food product. In a conveyor having threeparallel conveyor tracks, therefore, three food products may be conveyedadjacent to one another. In contrast, the term conveyor track does notas a rule imply that the conveying speed of the conveyor track isindividually adjustable. Thus within the context of the invention theremust be a differentiation between conveyors having a plurality ofconveyor tracks with a uniform conveying speed, on the one hand, andconveyors having a plurality of conveyor tracks, each with separatelyadjustable conveying speeds, on the other hand. The conveying speeds ofthe individual conveyor tracks are preferably separately adjustable forthe buffer conveyor and for the transfer conveyor. In contrast, theindividual conveyor tracks in the other conveyors preferably have auniform conveying speed.

With regard to the transfer conveyor, it should also be noted that thelatter may also be arranged in a device downstream, such as for instancein a feeder, as will be described in detail hereinafter.

It should furthermore be noted that the inventive conveyor devicepreferably has at least one product sensor that at the input of theconveyor device detects the product supply in the individual conveyortracks individually for each of the conveyor tracks. Such productsensors may function for instance by means of a camera, an ultrasoundsensor, or using mechanical scanning, but the invention is not limitedto these principles for the functioning of the product sensor.

The inventive conveyor device furthermore preferably includes a controlunit that is connected at the input side to the product sensors in orderto detect the supply of the conveyor tracks at the input to the conveyordevice. Moreover, the control unit controls the following actions of theconveyor device on the output side:

the pivot movement of the distributor conveyor,

the pivot movement of the buffer conveyor,

the conveying speed of the individual conveyor tracks of the bufferconveyor,

the transverse displacement of the shuttle conveyor or the transfermovement of the transfer robot,

the conveying speed of the individual conveyor tracks of the transferconveyor,

the conveying speed of the main flow conveyor, and,

the conveying speed of the distributor conveyor.

The aforesaid actions are controlled such that as many product gaps aspossible in the conveyor tracks are filled at the output.

It should furthermore be noted that the invention is not limited to theconveyor device described in the foregoing as an individual device. Onthe contrary, the invention also claims protection for a completeprocessing line for processing the food products having a slicingdevice, the inventive conveyor device, and a feeder for placing the foodproducts in packaging.

Finally, the invention also includes a corresponding method for productformatting of food products on a conveyor device, wherein the individualmethod steps proceed from the description in the foregoing, so that noseparate description of the individual method steps shah be providedhere.

Other advantageous refinements of the invention are characterized in thesubordinate claims or are explained in greater detail in the following,using the figures, together with the description of the preferredexemplary embodiments of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1A is a perspective elevation of an inventive conveyor device;

FIG. 1B is a side view of the conveyor device from FIG. 1A;

FIG. 1C is an enlarged detail from FIG. 1B in the input area of theconveyor device;

FIG. 1D is an enlargement of a detail from FIG. 1B in the center area ofthe conveyor device;

FIG. 1E is a top view of the conveyor device in accordance with FIGS.1A-1D;

FIG. 1F is a front elevation of the conveyor device in accordance withFIGS. 1A-1E from the output side;

FIG. 2 depicts an inventive processing line for processing foodproducts;

FIGS. 3A-3P are schematized top views of successive situations of theconveyor device; and,

FIG. 4 is a schematized top view of a conventional processing linehaving slicing device and a feeder.

DETAILED DESCRIPTION

FIGS. 1A through 1F depict different views of an inventive conveyordevice 10 for conveying food products (e.g. stacks of lunchmeat slices)from the slicing device 1 to the feeder 6, as is depicted in FIG. 2. Theconveyor device 10 has the object of filling any product gaps on one ofthe conveyor tracks 3, 4 of the output conveyor 2 of the slicing device1 so that the two conveyor tracks 7, 8 of the input conveyor 5 for thefeeder 6 are all supplied with food products at all times. This isimportant because for proper functioning the feeder 6 expects a productformat in which all conveyor tracks 7, 8 of the input conveyor 5 aresupplied with food products.

The inventive conveyor device includes a plurality of conveyors thathave different functions, specifically a distributor conveyor 11, abuffer conveyor 12, a main flow conveyor 13, a shuttle conveyor 14, andan output conveyor 15, wherein the food products are conveyed by theconveyor device 10 in the direction of the block arrow shown in FIG. 1B.

The distributor conveyor 11 transfers the food products incoming on theinput side from the output conveyor 2 for the slicing device 1 andselectively forwards the incoming food products to the buffer conveyor12 or to the main flow conveyor 13. To this end, the output end 16 ofthe distributor conveyor 11 may be pivoted vertically between the bufferconveyor 12 disposed above and the main flow conveyor 13 disposed below.The distributor conveyor 11 may thus be pivoted about a pivot axis 17 inthe direction of the double arrow. The pivot movement by the distributorconveyor 11 is driven by a drive shaft 18 that projects laterally from ahousing 19 of the conveyor device 10 and may be driven by an electricmotor, for instance.

In addition, the conveyor device 10 also has on its input side aplurality of sensors 24 that determine on the individual conveyor tracks3, 4 whether the conveyor tracks 3, 4 are supplied with food products.This is important so that the product gaps in the conveyor tracks 3, 4may subsequently be filled with food products.

The main flow conveyor 13 is arranged beneath the buffer conveyor 12 andconveys a main flow of the food products beneath the raised bufferconveyor 12.

The shuttle conveyor 14 is arranged downstream of the main flow conveyor13 in the conveying direction, wherein the shuttle conveyor 14 may bedisplaced as a whole at a right angle to the conveying direction, as isindicated by the double arrow in FIG. 1A. The shuttle conveyor 14 ispreferably displaced using electric motors in the housing 19 of theconveyor device 10. It should be noted that the shuttle conveyor 14 hasa wider conveyor width than the main flow conveyor 13 and the outputconveyor 15. This is important so that the shuttle conveyor 14 alwayscovers the entire conveyor width regardless of its displacement positiontransverse to the conveying direction.

Arranged in the conveying direction downstream of the shuttle conveyor14 is the output conveyor 15, which forwards the food products to theinput conveyor 5 for the feeder 6. What is important here is that theinput conveyor 5 for the feeder 6 has separately controllable conveyortracks 7, 8 in order to be able to transfer the food products for theindividual conveyor tracks 7, 8 independently of one another from theoutput conveyor 15 for the conveyor device 10.

The buffer conveyor 12 is arranged above the main flow conveyor 13,wherein the buffer conveyor 12 has an output end 20 that may beselectively lowered to the main flow conveyor 13 or raised from the mainflow conveyor 13, as shall be described in detail in the following. Thebuffer conveyor 12 may thus be pivoted about a pivot axis 21 in thedirection of the double arrow, wherein the pivot movement is driven viaa drive shaft 22 and a lever structure 23. The drive shaft 22 forpivoting the buffer conveyor 12 projects laterally out of the housing 19of the conveyor device 10 and is preferably also driven by an electricmotor.

If a product gap on one of the conveyor tracks must be filled, theoutput end 20 of the buffer conveyor 12 is lowered to the main flowconveyor 13 so that a food product may be transferred from the bufferconveyor 12 to the main flow conveyor 13.

In contrast, if no product gap needs to be filled, the output end 20 ofthe buffer conveyor 12 is raised from the main flow conveyor 13 so thatthe main flow of food products on the main flow conveyor is not blocked.

The following describes how the inventive conveyor device 10 functions,referencing FIGS. 3A-3B. FIGS. 3A and 3B each depict successivesituations during the operation of the conveyor device 10.

For the purposes of simplification, the buffer conveyor 12 is depictedin the top-view depictions in accordance with FIGS. 3A-3B adjacent tothe main flow conveyor 13 in order to make it possible to discern thesupply status of the main flow conveyor 13. However, the buffer conveyor12 is in fact above the main flow conveyor 13, as may be seen from FIGS.1A-1F.

In the situation in accordance with FIG. 3A, food products A-K enter ontwo parallel conveyor tracks on the output conveyor 2 of the slicingdevice 1. On the left-hand conveyor track, following the last foodproduct H, there are three product gaps that are filled in the contextof the inventive method, as shall be described in the following.

FIG. 3B illustrates the next situation, wherein the two first foodproducts A, B have moved onto the distributor conveyor 11.

In the next operating situation in accordance with FIG. 3C, first thebuffer conveyor 12 is filled in that the distributor conveyor 11conducts the two food products A, B onto the buffer conveyor. To thisend the distributor conveyor 11 is pivoted upward.

In the situation in accordance with FIG. 3D, the buffer conveyor 12 isstill being filled as well, so that the buffer conveyor 12 then includesfood products A, B, C, and D.

Following this the distributor conveyor 11 is then pivoted downward tothe main flow conveyor 13, whereupon the food products E, F are thenconducted onto the main flow conveyor 13, as is illustrated in FIG. 3E.

In method steps 3F-3H, the food products E-K are then further conveyedto the shuttle conveyor 14 so that the food products E, F are thendisposed on the shuttle conveyor 14, as is illustrated in FIG. 3H.

The food products E-K are then further conveyed via the shuttle conveyor14 and the output conveyor 15, as is illustrated in FIGS. 3I-3K.

In method step 3L, the shuttle conveyor 14 is then displaced to the leftwith respect to the conveyor device, which causes the food product J tobe transferred from the right-hand conveyor track to the left-handconveyor track.

In addition, in the situation in accordance with FIG. 3L, the bufferconveyor 12 is lowered onto the main flow conveyor 13, whereupon thefood product B is then transferred from the left-hand conveyor track ofthe buffer conveyor 12 to the left-hand conveyor track of the main flowconveyor 13.

Following this the food products J, K, and B are then conveyed furthervia the shuttle conveyor 14, and the food product B on the shuttleconveyor 14 then fills the last product gap adjacent to the food productK on the output conveyor 15, as is illustrated in FIG. 3O.

FIG. 3P illustrates the last step, in which the food products arearranged on the input conveyor 5 for the feeder 6 in a product formatthat is suitable for the feeder 6. In this product format, both producttracks are filled with two adjacent food products E-F, and K-B.

The invention is not limited to the preferred exemplary embodimentdescribed in the foregoing. On the contrary, a plethora of variants anddeviations are possible that also make use of the inventive thought andtherefore fall within the scope of protection. The invention also claimsin particular protection for the subject and the features of thesubordinate claims, regardless of the claims referenced. It is thereforealso possible within the context of the invention to realize the subjectof the main claim without all of the features of the main claim, butwith some features from the subordinate claims.

REFERENCE LIST

A-K Food products

1 Slicing device

2 Output conveyor for the slicing device

3 Right-hand conveyor track of the output conveyor for the slicingdevice

4 Left-hand conveyor track of the output conveyor for the slicing device

5 Input conveyor for the feeder

6 Feeder

7 Right-hand conveyor track of the input conveyor for the feeder

8 Left-hand conveyor track of the input conveyor for the feeder

9 Product gaps

10 Conveyor device

11 Distributor conveyor

12 Buffer conveyor

13 Main flow conveyor

14 Shuttle conveyor

15 Output conveyor

16 Output end of the distributor conveyor

17 Pivot axis of the distributor conveyor

18 Drive shaft for pivoting the buffer conveyor

19 Housing

20 Output end of the buffer conveyor

21 Pivot axis of the buffer conveyor

22 Drive shaft for pivoting the buffer conveyor

23 Lever structure for pivoting the buffer conveyor

24 Sensor

What is claimed is:
 1. A conveyor device for conveying food products instacks or interleaved units made of a plurality of slices of cheese ormeat products, the conveyor device comprising: a plurality of parallelconveyor tracks having an input side and an output side, wherein theconveyor device formats the food products in a specific product formaton the plurality of parallel conveyor tracks, and wherein the conveyordevice fills a product gap on one of the plurality of parallel conveyortracks incoming on the input side with a food product so that on theoutput side all parallel conveyor tracks are supplied with the foodproducts; at least one product sensor configured to detect a supply offood product on each conveyor track incoming on the input side; wherein,when an even number of product gaps exist on one of the conveyor tracks,the conveyor device fills the product gaps with a corresponding numberof food products from another one of the conveyor tracks that does nothave any product gaps such that at least one of the food products aretransferred from the conveyor track that does not have any product gapsto the conveyor track that has the product gaps; and wherein when thereis an odd number of product gaps on one of the conveyor tracks, theconveyor device also fills the product gaps with food products from aproduct buffer such that at least one of the food products istransferred from the product buffer to the conveyor track that has theproduct gap.
 2. The conveyor device according to claim 1, furthercomprising a distributor conveyor downstream of the conveying tracks; abuffer conveyor which forms the product buffer for the food products andis fed by the distributor conveyor with the food products; a main flowconveyor configured to convey a main flow of the food products and isselectively loaded with the food products from the distributor conveyoror from the buffer conveyor, the main flow conveyor being downstream ofthe distributor conveyor; and a shuttle conveyor for transferring thefood products between the parallel conveying tracks for filling theproduct gaps, wherein the shuttle conveyor is arranged in the conveyingdirection behind the main flow conveyor.
 3. The conveyor deviceaccording to claim 2, wherein the distributor conveyor with its outputend is vertically adjustable between the buffer conveyor and the mainflow conveyor in order to feed either the buffer conveyor or the mainflow conveyor with the food products entering on the input side.
 4. Theconveyor device according to claim 3, wherein the shuttle conveyor canbe moved transversely to the conveying direction.
 5. The conveyor deviceaccording to claim 2, wherein the shuttle conveyor can be movedtransversely to the conveying direction.
 6. The conveyor deviceaccording to claim 3, wherein the buffer conveyor is arranged above themain flow conveyor and is vertically adjustable with its output end, thebuffer conveyor with its output end can be lowered to the main flowconveyor in order to place one of the food products on the main flowconveyor for the subsequent filling of a product gap, and the bufferconveyor with its output end can be lifted by the main flow conveyor inorder not to block the continuous main flow of food products.
 7. Theconveyor device according to claim 2, wherein in the buffer conveyor theconveying speed of the individual conveying tracks is separatelyadjustable from another, so that the buffer conveyor can transfer asingle food product on only one of the conveying tracks to the main flowconveyor.
 8. The conveyor device according to claim 2, furthercomprising a transfer conveyor with several parallel conveying tracks,wherein the transfer conveyor is arranged in the conveying directionbehind the shuttle conveyor and is fed by the shuttle conveyor with thefood products, wherein in the transfer conveyor the conveying speed ofthe individual conveying tracks is separately adjustable to take overonly a single food product in only one of the conveying tracks.